Synthesis of layered-layered 0.5Li2MnO3ㆍ0.5LiCoO2 nanocomposite electrode materials by the mechanochemical process and first principles study

Title
Synthesis of layered-layered 0.5Li2MnO3ㆍ0.5LiCoO2 nanocomposite electrode materials by the mechanochemical process and first principles study
Authors
김수김천중전영인노재교Sesha Hari VemuriRobert Smith정경윤Myung S. Jhon조병원
Keywords
Li2MnO3-stabilized LiCoO2; nanocomposite; first principles
Issue Date
2012-12
Publisher
Journal of materials chemistry
Citation
VOL 22, NO 48, 25418-25426
Abstract
Li2MnO3-stabilized LiCoO2 electrode materials were synthesized using the method of mechanochemical process. Li2MnO3 was prepared and the mechanochemical process was carried out with LiCoO2, which yielded the layered–layered integrated structure nanocomposites. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and high-resolution transmission electron microscopy studies confirmed the structural integration of 0.5Li2MnO3·0.5LiCoO2 electrode materials. We also performed the high temperature heat treatment, where our 0.5Li2MnO3·0.5LiCoO2 electrode materials showed improvement in the discharge capacity (180 mA h g−1) with good cycleability. To obtain a physical insight into the performance of the nanocomposite structure, we carried out first principles calculations to obtain activation energy barriers of Li+ de-/intercalation, which suggested that utilizing both Li2MnO3 and LiCoO2 components can enhance the Li+ diffusion for the layered–layered integrated structure.
URI
http://pubs.kist.re.kr/handle/201004/44249
ISSN
09599428
Appears in Collections:
KIST Publication > Article
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